#include <iostream>
#include <string>
#include <set>
#include <sstream>
using namespace std;

set<string> dict;

int main()
{
	string s,buf;
	while(cin >> s){
		for(int i=0;i < s.length();i++){
			if(isalpha(s[i]))
				s[i] = tolower(s[i]);
			else
				s[i] = ' ';
		}
		stringstream ss(s);
		while(ss >> buf)
			dict.insert(buf);
	}
	for(set<string>::iterator it = dict.begin();it != dict.end();++it){
		cout << *it << "\n";
	}
	return 0;
}
